Mask assembly



FIG. 1 is a front perspective view of a mask assembly according to ourdesign;

FIG. 2 is a front view of the mask assembly shown in FIG. 1;

FIG. 3 is a rear view of the mask assembly shown in FIG. 1;

FIG. 4 is a right hand side view of the mask assembly shown in FIG. 1,with the left hand side view being a mirror image thereof;

FIG. 5 is a top view of the mask assembly shown in FIG. 1; and,

FIG. 6 is a bottom view of the mask assembly shown in FIG. 1.

The ornamental design for a mask assembly, as shown.